git.oblomov.eu Git - linux-2.6/blob - drivers/media/video/cx18/cx18-fileops.c

   1 /*
   2  *  cx18 file operation functions
   3  *
   4  *  Derived from ivtv-fileops.c
   5  *
   6  *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  21  *  02111-1307  USA
  22  */
  23
  24 #include "cx18-driver.h"
  25 #include "cx18-fileops.h"
  26 #include "cx18-i2c.h"
  27 #include "cx18-queue.h"
  28 #include "cx18-vbi.h"
  29 #include "cx18-audio.h"
  30 #include "cx18-mailbox.h"
  31 #include "cx18-scb.h"
  32 #include "cx18-streams.h"
  33 #include "cx18-controls.h"
  34 #include "cx18-ioctl.h"
  35 #include "cx18-cards.h"
  36
  37 /* This function tries to claim the stream for a specific file descriptor.
  38    If no one else is using this stream then the stream is claimed and
  39    associated VBI streams are also automatically claimed.
  40    Possible error returns: -EBUSY if someone else has claimed
  41    the stream or 0 on success. */
  42 static int cx18_claim_stream(struct cx18_open_id *id, int type)
  43 {
  44         struct cx18 *cx = id->cx;
  45         struct cx18_stream *s = &cx->streams[type];
  46         struct cx18_stream *s_vbi;
  47         int vbi_type;
  48
  49         if (test_and_set_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
  50                 /* someone already claimed this stream */
  51                 if (s->id == id->open_id) {
  52                         /* yes, this file descriptor did. So that's OK. */
  53                         return 0;
  54                 }
  55                 if (s->id == -1 && type == CX18_ENC_STREAM_TYPE_VBI) {
  56                         /* VBI is handled already internally, now also assign
  57                            the file descriptor to this stream for external
  58                            reading of the stream. */
  59                         s->id = id->open_id;
  60                         CX18_DEBUG_INFO("Start Read VBI\n");
  61                         return 0;
  62                 }
  63                 /* someone else is using this stream already */
  64                 CX18_DEBUG_INFO("Stream %d is busy\n", type);
  65                 return -EBUSY;
  66         }
  67         s->id = id->open_id;
  68
  69         /* CX18_DEC_STREAM_TYPE_MPG needs to claim CX18_DEC_STREAM_TYPE_VBI,
  70            CX18_ENC_STREAM_TYPE_MPG needs to claim CX18_ENC_STREAM_TYPE_VBI
  71            (provided VBI insertion is on and sliced VBI is selected), for all
  72            other streams we're done */
  73         if (type == CX18_ENC_STREAM_TYPE_MPG &&
  74                    cx->vbi.insert_mpeg && cx->vbi.sliced_in->service_set) {
  75                 vbi_type = CX18_ENC_STREAM_TYPE_VBI;
  76         } else {
  77                 return 0;
  78         }
  79         s_vbi = &cx->streams[vbi_type];
  80
  81         set_bit(CX18_F_S_CLAIMED, &s_vbi->s_flags);
  82
  83         /* mark that it is used internally */
  84         set_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags);
  85         return 0;
  86 }
  87
  88 /* This function releases a previously claimed stream. It will take into
  89    account associated VBI streams. */
  90 static void cx18_release_stream(struct cx18_stream *s)
  91 {
  92         struct cx18 *cx = s->cx;
  93         struct cx18_stream *s_vbi;
  94
  95         s->id = -1;
  96         if (s->type == CX18_ENC_STREAM_TYPE_VBI &&
  97                 test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags)) {
  98                 /* this stream is still in use internally */
  99                 return;
 100         }
 101         if (!test_and_clear_bit(CX18_F_S_CLAIMED, &s->s_flags)) {
 102                 CX18_DEBUG_WARN("Release stream %s not in use!\n", s->name);
 103                 return;
 104         }
 105
 106         cx18_flush_queues(s);
 107
 108         /* CX18_ENC_STREAM_TYPE_MPG needs to release CX18_ENC_STREAM_TYPE_VBI,
 109            for all other streams we're done */
 110         if (s->type == CX18_ENC_STREAM_TYPE_MPG)
 111                 s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 112         else
 113                 return;
 114
 115         /* clear internal use flag */
 116         if (!test_and_clear_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
 117                 /* was already cleared */
 118                 return;
 119         }
 120         if (s_vbi->id != -1) {
 121                 /* VBI stream still claimed by a file descriptor */
 122                 return;
 123         }
 124         clear_bit(CX18_F_S_CLAIMED, &s_vbi->s_flags);
 125         cx18_flush_queues(s_vbi);
 126 }
 127
 128 static void cx18_dualwatch(struct cx18 *cx)
 129 {
 130         struct v4l2_tuner vt;
 131         u16 new_bitmap;
 132         u16 new_stereo_mode;
 133         const u16 stereo_mask = 0x0300;
 134         const u16 dual = 0x0200;
 135         u32 h;
 136
 137         new_stereo_mode = cx->params.audio_properties & stereo_mask;
 138         memset(&vt, 0, sizeof(vt));
 139         cx18_call_i2c_clients(cx, VIDIOC_G_TUNER, &vt);
 140         if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 &&
 141                         (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
 142                 new_stereo_mode = dual;
 143
 144         if (new_stereo_mode == cx->dualwatch_stereo_mode)
 145                 return;
 146
 147         new_bitmap = new_stereo_mode
 148                         | (cx->params.audio_properties & ~stereo_mask);
 149
 150         CX18_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x. "
 151                         "new audio_bitmask=0x%ux\n",
 152                         cx->dualwatch_stereo_mode, new_stereo_mode, new_bitmap);
 153
 154         h = cx18_find_handle(cx);
 155         if (h == CX18_INVALID_TASK_HANDLE) {
 156                 CX18_DEBUG_INFO("dualwatch: can't find valid task handle\n");
 157                 return;
 158         }
 159
 160         if (cx18_vapi(cx,
 161                       CX18_CPU_SET_AUDIO_PARAMETERS, 2, h, new_bitmap) == 0) {
 162                 cx->dualwatch_stereo_mode = new_stereo_mode;
 163                 return;
 164         }
 165         CX18_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
 166 }
 167
 168
 169 static struct cx18_buffer *cx18_get_buffer(struct cx18_stream *s, int non_block, int *err)
 170 {
 171         struct cx18 *cx = s->cx;
 172         struct cx18_stream *s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 173         struct cx18_buffer *buf;
 174         DEFINE_WAIT(wait);
 175
 176         *err = 0;
 177         while (1) {
 178                 if (s->type == CX18_ENC_STREAM_TYPE_MPG) {
 179
 180                         if (time_after(jiffies, cx->dualwatch_jiffies + msecs_to_jiffies(1000))) {
 181                                 cx->dualwatch_jiffies = jiffies;
 182                                 cx18_dualwatch(cx);
 183                         }
 184                         if (test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 185                             !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
 186                                 while ((buf = cx18_dequeue(s_vbi, &s_vbi->q_full))) {
 187                                         /* byteswap and process VBI data */
 188 /*                                      cx18_process_vbi_data(cx, buf, s_vbi->dma_pts, s_vbi->type); */
 189                                         cx18_enqueue(s_vbi, buf, &s_vbi->q_free);
 190                                 }
 191                         }
 192                         buf = &cx->vbi.sliced_mpeg_buf;
 193                         if (buf->readpos != buf->bytesused)
 194                                 return buf;
 195                 }
 196
 197                 /* do we have leftover data? */
 198                 buf = cx18_dequeue(s, &s->q_io);
 199                 if (buf)
 200                         return buf;
 201
 202                 /* do we have new data? */
 203                 buf = cx18_dequeue(s, &s->q_full);
 204                 if (buf) {
 205                         if (!test_and_clear_bit(CX18_F_B_NEED_BUF_SWAP,
 206                                                 &buf->b_flags))
 207                                 return buf;
 208                         if (s->type == CX18_ENC_STREAM_TYPE_MPG)
 209                                 /* byteswap MPG data */
 210                                 cx18_buf_swap(buf);
 211                         else {
 212                                 /* byteswap and process VBI data */
 213                                 cx18_process_vbi_data(cx, buf,
 214                                                 s->dma_pts, s->type);
 215                         }
 216                         return buf;
 217                 }
 218
 219                 /* return if end of stream */
 220                 if (!test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 221                         CX18_DEBUG_INFO("EOS %s\n", s->name);
 222                         return NULL;
 223                 }
 224
 225                 /* return if file was opened with O_NONBLOCK */
 226                 if (non_block) {
 227                         *err = -EAGAIN;
 228                         return NULL;
 229                 }
 230
 231                 /* wait for more data to arrive */
 232                 prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
 233                 /* New buffers might have become available before we were added
 234                    to the waitqueue */
 235                 if (!atomic_read(&s->q_full.buffers))
 236                         schedule();
 237                 finish_wait(&s->waitq, &wait);
 238                 if (signal_pending(current)) {
 239                         /* return if a signal was received */
 240                         CX18_DEBUG_INFO("User stopped %s\n", s->name);
 241                         *err = -EINTR;
 242                         return NULL;
 243                 }
 244         }
 245 }
 246
 247 static void cx18_setup_sliced_vbi_buf(struct cx18 *cx)
 248 {
 249         int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
 250
 251         cx->vbi.sliced_mpeg_buf.buf = cx->vbi.sliced_mpeg_data[idx];
 252         cx->vbi.sliced_mpeg_buf.bytesused = cx->vbi.sliced_mpeg_size[idx];
 253         cx->vbi.sliced_mpeg_buf.readpos = 0;
 254 }
 255
 256 static size_t cx18_copy_buf_to_user(struct cx18_stream *s,
 257                 struct cx18_buffer *buf, char __user *ubuf, size_t ucount)
 258 {
 259         struct cx18 *cx = s->cx;
 260         size_t len = buf->bytesused - buf->readpos;
 261
 262         if (len > ucount)
 263                 len = ucount;
 264         if (cx->vbi.insert_mpeg && s->type == CX18_ENC_STREAM_TYPE_MPG &&
 265             cx->vbi.sliced_in->service_set && buf != &cx->vbi.sliced_mpeg_buf) {
 266                 const char *start = buf->buf + buf->readpos;
 267                 const char *p = start + 1;
 268                 const u8 *q;
 269                 u8 ch = cx->search_pack_header ? 0xba : 0xe0;
 270                 int stuffing, i;
 271
 272                 while (start + len > p) {
 273                         q = memchr(p, 0, start + len - p);
 274                         if (q == NULL)
 275                                 break;
 276                         p = q + 1;
 277                         if ((char *)q + 15 >= buf->buf + buf->bytesused ||
 278                             q[1] != 0 || q[2] != 1 || q[3] != ch)
 279                                 continue;
 280                         if (!cx->search_pack_header) {
 281                                 if ((q[6] & 0xc0) != 0x80)
 282                                         continue;
 283                                 if (((q[7] & 0xc0) == 0x80 &&
 284                                      (q[9] & 0xf0) == 0x20) ||
 285                                     ((q[7] & 0xc0) == 0xc0 &&
 286                                      (q[9] & 0xf0) == 0x30)) {
 287                                         ch = 0xba;
 288                                         cx->search_pack_header = 1;
 289                                         p = q + 9;
 290                                 }
 291                                 continue;
 292                         }
 293                         stuffing = q[13] & 7;
 294                         /* all stuffing bytes must be 0xff */
 295                         for (i = 0; i < stuffing; i++)
 296                                 if (q[14 + i] != 0xff)
 297                                         break;
 298                         if (i == stuffing &&
 299                             (q[4] & 0xc4) == 0x44 &&
 300                             (q[12] & 3) == 3 &&
 301                             q[14 + stuffing] == 0 &&
 302                             q[15 + stuffing] == 0 &&
 303                             q[16 + stuffing] == 1) {
 304                                 cx->search_pack_header = 0;
 305                                 len = (char *)q - start;
 306                                 cx18_setup_sliced_vbi_buf(cx);
 307                                 break;
 308                         }
 309                 }
 310         }
 311         if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
 312                 CX18_DEBUG_WARN("copy %zd bytes to user failed for %s\n",
 313                                 len, s->name);
 314                 return -EFAULT;
 315         }
 316         buf->readpos += len;
 317         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 318             buf != &cx->vbi.sliced_mpeg_buf)
 319                 cx->mpg_data_received += len;
 320         return len;
 321 }
 322
 323 static ssize_t cx18_read(struct cx18_stream *s, char __user *ubuf,
 324                 size_t tot_count, int non_block)
 325 {
 326         struct cx18 *cx = s->cx;
 327         size_t tot_written = 0;
 328         int single_frame = 0;
 329
 330         if (atomic_read(&cx->ana_capturing) == 0 && s->id == -1) {
 331                 /* shouldn't happen */
 332                 CX18_DEBUG_WARN("Stream %s not initialized before read\n",
 333                                 s->name);
 334                 return -EIO;
 335         }
 336
 337         /* Each VBI buffer is one frame, the v4l2 API says that for VBI the
 338            frames should arrive one-by-one, so make sure we never output more
 339            than one VBI frame at a time */
 340         if (s->type == CX18_ENC_STREAM_TYPE_VBI &&
 341             cx->vbi.sliced_in->service_set)
 342                 single_frame = 1;
 343
 344         for (;;) {
 345                 struct cx18_buffer *buf;
 346                 int rc;
 347
 348                 buf = cx18_get_buffer(s, non_block, &rc);
 349                 /* if there is no data available... */
 350                 if (buf == NULL) {
 351                         /* if we got data, then return that regardless */
 352                         if (tot_written)
 353                                 break;
 354                         /* EOS condition */
 355                         if (rc == 0) {
 356                                 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 357                                 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
 358                                 cx18_release_stream(s);
 359                         }
 360                         /* set errno */
 361                         return rc;
 362                 }
 363
 364                 rc = cx18_copy_buf_to_user(s, buf, ubuf + tot_written,
 365                                 tot_count - tot_written);
 366
 367                 if (buf != &cx->vbi.sliced_mpeg_buf) {
 368                         if (buf->readpos == buf->bytesused) {
 369                                 cx18_buf_sync_for_device(s, buf);
 370                                 cx18_enqueue(s, buf, &s->q_free);
 371                                 cx18_vapi(cx, CX18_CPU_DE_SET_MDL, 5,
 372                                         s->handle,
 373                                         (void __iomem *)&cx->scb->cpu_mdl[buf->id] -
 374                                           cx->enc_mem,
 375                                         1, buf->id, s->buf_size);
 376                         } else
 377                                 cx18_enqueue(s, buf, &s->q_io);
 378                 } else if (buf->readpos == buf->bytesused) {
 379                         int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
 380
 381                         cx->vbi.sliced_mpeg_size[idx] = 0;
 382                         cx->vbi.inserted_frame++;
 383                         cx->vbi_data_inserted += buf->bytesused;
 384                 }
 385                 if (rc < 0)
 386                         return rc;
 387                 tot_written += rc;
 388
 389                 if (tot_written == tot_count || single_frame)
 390                         break;
 391         }
 392         return tot_written;
 393 }
 394
 395 static ssize_t cx18_read_pos(struct cx18_stream *s, char __user *ubuf,
 396                 size_t count, loff_t *pos, int non_block)
 397 {
 398         ssize_t rc = count ? cx18_read(s, ubuf, count, non_block) : 0;
 399         struct cx18 *cx = s->cx;
 400
 401         CX18_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
 402         if (rc > 0)
 403                 pos += rc;
 404         return rc;
 405 }
 406
 407 int cx18_start_capture(struct cx18_open_id *id)
 408 {
 409         struct cx18 *cx = id->cx;
 410         struct cx18_stream *s = &cx->streams[id->type];
 411         struct cx18_stream *s_vbi;
 412
 413         if (s->type == CX18_ENC_STREAM_TYPE_RAD) {
 414                 /* you cannot read from these stream types. */
 415                 return -EPERM;
 416         }
 417
 418         /* Try to claim this stream. */
 419         if (cx18_claim_stream(id, s->type))
 420                 return -EBUSY;
 421
 422         /* If capture is already in progress, then we also have to
 423            do nothing extra. */
 424         if (test_bit(CX18_F_S_STREAMOFF, &s->s_flags) ||
 425             test_and_set_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 426                 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
 427                 return 0;
 428         }
 429
 430         /* Start VBI capture if required */
 431         s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 432         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 433             test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
 434             !test_and_set_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
 435                 /* Note: the CX18_ENC_STREAM_TYPE_VBI is claimed
 436                    automatically when the MPG stream is claimed.
 437                    We only need to start the VBI capturing. */
 438                 if (cx18_start_v4l2_encode_stream(s_vbi)) {
 439                         CX18_DEBUG_WARN("VBI capture start failed\n");
 440
 441                         /* Failure, clean up and return an error */
 442                         clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
 443                         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 444                         /* also releases the associated VBI stream */
 445                         cx18_release_stream(s);
 446                         return -EIO;
 447                 }
 448                 CX18_DEBUG_INFO("VBI insertion started\n");
 449         }
 450
 451         /* Tell the card to start capturing */
 452         if (!cx18_start_v4l2_encode_stream(s)) {
 453                 /* We're done */
 454                 set_bit(CX18_F_S_APPL_IO, &s->s_flags);
 455                 /* Resume a possibly paused encoder */
 456                 if (test_and_clear_bit(CX18_F_I_ENC_PAUSED, &cx->i_flags))
 457                         cx18_vapi(cx, CX18_CPU_CAPTURE_PAUSE, 1, s->handle);
 458                 return 0;
 459         }
 460
 461         /* failure, clean up */
 462         CX18_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
 463
 464         /* Note: the CX18_ENC_STREAM_TYPE_VBI is released
 465            automatically when the MPG stream is released.
 466            We only need to stop the VBI capturing. */
 467         if (s->type == CX18_ENC_STREAM_TYPE_MPG &&
 468             test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags)) {
 469                 cx18_stop_v4l2_encode_stream(s_vbi, 0);
 470                 clear_bit(CX18_F_S_STREAMING, &s_vbi->s_flags);
 471         }
 472         clear_bit(CX18_F_S_STREAMING, &s->s_flags);
 473         cx18_release_stream(s);
 474         return -EIO;
 475 }
 476
 477 ssize_t cx18_v4l2_read(struct file *filp, char __user *buf, size_t count,
 478                 loff_t *pos)
 479 {
 480         struct cx18_open_id *id = filp->private_data;
 481         struct cx18 *cx = id->cx;
 482         struct cx18_stream *s = &cx->streams[id->type];
 483         int rc;
 484
 485         CX18_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
 486
 487         mutex_lock(&cx->serialize_lock);
 488         rc = cx18_start_capture(id);
 489         mutex_unlock(&cx->serialize_lock);
 490         if (rc)
 491                 return rc;
 492         return cx18_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
 493 }
 494
 495 unsigned int cx18_v4l2_enc_poll(struct file *filp, poll_table *wait)
 496 {
 497         struct cx18_open_id *id = filp->private_data;
 498         struct cx18 *cx = id->cx;
 499         struct cx18_stream *s = &cx->streams[id->type];
 500         int eof = test_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 501
 502         /* Start a capture if there is none */
 503         if (!eof && !test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 504                 int rc;
 505
 506                 mutex_lock(&cx->serialize_lock);
 507                 rc = cx18_start_capture(id);
 508                 mutex_unlock(&cx->serialize_lock);
 509                 if (rc) {
 510                         CX18_DEBUG_INFO("Could not start capture for %s (%d)\n",
 511                                         s->name, rc);
 512                         return POLLERR;
 513                 }
 514                 CX18_DEBUG_FILE("Encoder poll started capture\n");
 515         }
 516
 517         /* add stream's waitq to the poll list */
 518         CX18_DEBUG_HI_FILE("Encoder poll\n");
 519         poll_wait(filp, &s->waitq, wait);
 520
 521         if (atomic_read(&s->q_full.buffers) || atomic_read(&s->q_io.buffers))
 522                 return POLLIN | POLLRDNORM;
 523         if (eof)
 524                 return POLLHUP;
 525         return 0;
 526 }
 527
 528 void cx18_stop_capture(struct cx18_open_id *id, int gop_end)
 529 {
 530         struct cx18 *cx = id->cx;
 531         struct cx18_stream *s = &cx->streams[id->type];
 532
 533         CX18_DEBUG_IOCTL("close() of %s\n", s->name);
 534
 535         /* 'Unclaim' this stream */
 536
 537         /* Stop capturing */
 538         if (test_bit(CX18_F_S_STREAMING, &s->s_flags)) {
 539                 struct cx18_stream *s_vbi =
 540                         &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
 541
 542                 CX18_DEBUG_INFO("close stopping capture\n");
 543                 /* Special case: a running VBI capture for VBI insertion
 544                    in the mpeg stream. Need to stop that too. */
 545                 if (id->type == CX18_ENC_STREAM_TYPE_MPG &&
 546                     test_bit(CX18_F_S_STREAMING, &s_vbi->s_flags) &&
 547                     !test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
 548                         CX18_DEBUG_INFO("close stopping embedded VBI capture\n");
 549                         cx18_stop_v4l2_encode_stream(s_vbi, 0);
 550                 }
 551                 if (id->type == CX18_ENC_STREAM_TYPE_VBI &&
 552                     test_bit(CX18_F_S_INTERNAL_USE, &s->s_flags))
 553                         /* Also used internally, don't stop capturing */
 554                         s->id = -1;
 555                 else
 556                         cx18_stop_v4l2_encode_stream(s, gop_end);
 557         }
 558         if (!gop_end) {
 559                 clear_bit(CX18_F_S_APPL_IO, &s->s_flags);
 560                 clear_bit(CX18_F_S_STREAMOFF, &s->s_flags);
 561                 cx18_release_stream(s);
 562         }
 563 }
 564
 565 int cx18_v4l2_close(struct inode *inode, struct file *filp)
 566 {
 567         struct cx18_open_id *id = filp->private_data;
 568         struct cx18 *cx = id->cx;
 569         struct cx18_stream *s = &cx->streams[id->type];
 570
 571         CX18_DEBUG_IOCTL("close() of %s\n", s->name);
 572
 573         v4l2_prio_close(&cx->prio, &id->prio);
 574
 575         /* Easy case first: this stream was never claimed by us */
 576         if (s->id != id->open_id) {
 577                 kfree(id);
 578                 return 0;
 579         }
 580
 581         /* 'Unclaim' this stream */
 582
 583         /* Stop radio */
 584         mutex_lock(&cx->serialize_lock);
 585         if (id->type == CX18_ENC_STREAM_TYPE_RAD) {
 586                 /* Closing radio device, return to TV mode */
 587                 cx18_mute(cx);
 588                 /* Mark that the radio is no longer in use */
 589                 clear_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
 590                 /* Switch tuner to TV */
 591                 cx18_call_i2c_clients(cx, VIDIOC_S_STD, &cx->std);
 592                 /* Select correct audio input (i.e. TV tuner or Line in) */
 593                 cx18_audio_set_io(cx);
 594                 if (atomic_read(&cx->ana_capturing) > 0) {
 595                         /* Undo video mute */
 596                         cx18_vapi(cx, CX18_CPU_SET_VIDEO_MUTE, 2, s->handle,
 597                                 cx->params.video_mute |
 598                                         (cx->params.video_mute_yuv << 8));
 599                 }
 600                 /* Done! Unmute and continue. */
 601                 cx18_unmute(cx);
 602                 cx18_release_stream(s);
 603         } else {
 604                 cx18_stop_capture(id, 0);
 605         }
 606         kfree(id);
 607         mutex_unlock(&cx->serialize_lock);
 608         return 0;
 609 }
 610
 611 static int cx18_serialized_open(struct cx18_stream *s, struct file *filp)
 612 {
 613         struct cx18 *cx = s->cx;
 614         struct cx18_open_id *item;
 615
 616         CX18_DEBUG_FILE("open %s\n", s->name);
 617
 618         /* Allocate memory */
 619         item = kmalloc(sizeof(struct cx18_open_id), GFP_KERNEL);
 620         if (NULL == item) {
 621                 CX18_DEBUG_WARN("nomem on v4l2 open\n");
 622                 return -ENOMEM;
 623         }
 624         item->cx = cx;
 625         item->type = s->type;
 626         v4l2_prio_open(&cx->prio, &item->prio);
 627
 628         item->open_id = cx->open_id++;
 629         filp->private_data = item;
 630
 631         if (item->type == CX18_ENC_STREAM_TYPE_RAD) {
 632                 /* Try to claim this stream */
 633                 if (cx18_claim_stream(item, item->type)) {
 634                         /* No, it's already in use */
 635                         kfree(item);
 636                         return -EBUSY;
 637                 }
 638
 639                 if (!test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) {
 640                         if (atomic_read(&cx->ana_capturing) > 0) {
 641                                 /* switching to radio while capture is
 642                                    in progress is not polite */
 643                                 cx18_release_stream(s);
 644                                 kfree(item);
 645                                 return -EBUSY;
 646                         }
 647                 }
 648
 649                 /* Mark that the radio is being used. */
 650                 set_bit(CX18_F_I_RADIO_USER, &cx->i_flags);
 651                 /* We have the radio */
 652                 cx18_mute(cx);
 653                 /* Switch tuner to radio */
 654                 cx18_call_i2c_clients(cx, AUDC_SET_RADIO, NULL);
 655                 /* Select the correct audio input (i.e. radio tuner) */
 656                 cx18_audio_set_io(cx);
 657                 /* Done! Unmute and continue. */
 658                 cx18_unmute(cx);
 659         }
 660         return 0;
 661 }
 662
 663 int cx18_v4l2_open(struct inode *inode, struct file *filp)
 664 {
 665         int res, x, y = 0;
 666         struct cx18 *cx = NULL;
 667         struct cx18_stream *s = NULL;
 668         int minor = iminor(inode);
 669
 670         /* Find which card this open was on */
 671         spin_lock(&cx18_cards_lock);
 672         for (x = 0; cx == NULL && x < cx18_cards_active; x++) {
 673                 /* find out which stream this open was on */
 674                 for (y = 0; y < CX18_MAX_STREAMS; y++) {
 675                         if (cx18_cards[x] == NULL)
 676                                 continue;
 677                         s = &cx18_cards[x]->streams[y];
 678                         if (s->v4l2dev && s->v4l2dev->minor == minor) {
 679                                 cx = cx18_cards[x];
 680                                 break;
 681                         }
 682                 }
 683         }
 684         spin_unlock(&cx18_cards_lock);
 685
 686         if (cx == NULL) {
 687                 /* Couldn't find a device registered
 688                    on that minor, shouldn't happen! */
 689                 printk(KERN_WARNING "No cx18 device found on minor %d\n",
 690                                 minor);
 691                 return -ENXIO;
 692         }
 693
 694         mutex_lock(&cx->serialize_lock);
 695         if (cx18_init_on_first_open(cx)) {
 696                 CX18_ERR("Failed to initialize on minor %d\n", minor);
 697                 mutex_unlock(&cx->serialize_lock);
 698                 return -ENXIO;
 699         }
 700         res = cx18_serialized_open(s, filp);
 701         mutex_unlock(&cx->serialize_lock);
 702         return res;
 703 }
 704
 705 void cx18_mute(struct cx18 *cx)
 706 {
 707         u32 h;
 708         if (atomic_read(&cx->ana_capturing)) {
 709                 h = cx18_find_handle(cx);
 710                 if (h != CX18_INVALID_TASK_HANDLE)
 711                         cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 1);
 712                 else
 713                         CX18_ERR("Can't find valid task handle for mute\n");
 714         }
 715         CX18_DEBUG_INFO("Mute\n");
 716 }
 717
 718 void cx18_unmute(struct cx18 *cx)
 719 {
 720         u32 h;
 721         if (atomic_read(&cx->ana_capturing)) {
 722                 h = cx18_find_handle(cx);
 723                 if (h != CX18_INVALID_TASK_HANDLE) {
 724                         cx18_msleep_timeout(100, 0);
 725                         cx18_vapi(cx, CX18_CPU_SET_MISC_PARAMETERS, 2, h, 12);
 726                         cx18_vapi(cx, CX18_CPU_SET_AUDIO_MUTE, 2, h, 0);
 727                 } else
 728                         CX18_ERR("Can't find valid task handle for unmute\n");
 729         }
 730         CX18_DEBUG_INFO("Unmute\n");
 731 }